Underwater image defogging and color cast correction method based on bright channel transmissivity compensation

An underwater image and correction method technology, applied in the field of image processing, can solve problems such as poor performance, and achieve the effect of natural performance of details

Active Publication Date: 2019-10-11
WUHAN INSTITUTE OF TECHNOLOGY
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  • Underwater image defogging and color cast correction method based on bright channel transmissivity compensation
  • Underwater image defogging and color cast correction method based on bright channel transmissivity compensation
  • Underwater image defogging and color cast correction method based on bright channel transmissivity compensation

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[0054] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0055] like figure 1 as shown in figure 1 As shown, it is an implementation flowchart of the underwater image defogging and color cast correction method based on bright channel transmittance compensation in the present invention, and the specific steps are as follows:

[0056] S1. Input underwater foggy color cast image I;

[0057] S2. Perform normalization processing on the underwater foggy color cast image I, so that the gray value of the entire image is between 0-255;

[0058] S3, use the maximum value filter to filter the grayscale images of the red, green and blue channels of I respectively, and obtain the bright ch...

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Abstract

The invention discloses an underwater image defogging and color cast correction method based on bright channel transmissivity compensation. The method comprises the following steps: firstly, extracting bright channel graphs of three channels, and then sorting according to the maximum brightness to find out a pixel gray value of an underwater degraded image position corresponding to the first 0.2%of the darkest pixel of each channel as an estimated value of background light; aiming at the color cast problem of the underwater degraded image, carrying out negation operation correction on the transmissivity of the red channel, correcting the rough transmissivity of G and B according to the relation of attenuation coefficients, and obtaining accurate estimation of the transmissivity of G and B; extracting the maximum values of the transmissivity of R, G and B channels of each pixel point, and obtaining a final fine transmissivity graph by adopting fast guided filtering; and finally, performing weighted background light color cast correction normalization processing according to the underwater image model to obtain a restored image. According to the image processing method, the problemof color cast caused by inaccurate transmittance estimation can be well solved while image defogging is carried out.

Description

technical field [0001] The invention relates to image processing technology, in particular to an underwater image defogging and color cast correction method based on bright channel transmittance compensation. Background technique [0002] Underwater image processing is of great significance for ocean exploration and development, underwater rescue, and military applications. During the process, visible light has problems such as scattering, absorption, and fast attenuation, and the acquired image is fogged, and the color cast is serious in the deep sea. As a result, the visibility of underwater images is poor, and underwater target detection and recognition fail. [0003] When light encounters underwater particles, it will scatter and attenuate, resulting in fog in the acquired underwater image. The farther the depth of field is, the greater the impact of fog will be. At the same time, because the longer the wavelength of light, the faster it is absorbed, and the red light ...

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/003G06T5/006G06T2207/10004Y02A90/30
Inventor 时愈孙殿君华夏冯雅媛王梦琪
Owner WUHAN INSTITUTE OF TECHNOLOGY
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